Waters Xevo TQD Operator's, Overview And Maintenance Manual page 147

6. Use the 10-mm wrench to remove the probe tip.
10-mm wrench
Probe tip
If the probe tip is difficult to remove, use the 7-mm wrench in
Tip:
conjunction with the 10-mm wrench.
7-mm wrench
10-mm wrench
Probe tip
Replacing the ESI probe sample capillary 4-71